【摘要】 为了进一步提高延安气田中区北部下古生界碳酸盐岩气藏产能规模，针对该区域沟槽发育复杂、非均衡开发严重和低压气藏开发难度大等问题，开展了针对性的关键技术研究与攻关。研究结果表明：1)通过动静态结合的古沟槽刻画技术，明确了研究区具有“北部东西向侵蚀沟槽与南部局部浅坑并存”的古地貌特征，落实马五₁₊₂储层有利区面积新增75 km²,为下步井位部署提供有力依据；2)针对碳酸盐岩储层裂缝孔洞识别难度大的问题，建立了裂缝孔洞定量识别方法，明确主力产层马五₁³层以孔洞型和裂缝孔隙型储层为主，次产层（马五₁¹层、马五₁²层、马五₁⁴层、马五₂¹层和马五₂²层）以孔隙型和致密型为主；3)通过对开发单元的定量划分与精细调控，气藏综合递减率由18.5%降低至15.0%,有效缓解了气田的非均衡开发；4)针对风化壳气藏特征与酸压改造存在问题，通过优化酸压工艺参数，引进生物酸等清洁酸液体系，对不同储层特征采取适合的工艺体系，有效降低酸岩反应速率，提升阻垢性能，使酸压改造效果显著提升。关键技术应用后，延安气田中区北部下古生界气藏平均单井试气无阻7.69×10⁴ m³/d,有力支撑了该区域快速和高效建产。更多还原

【Abstract】 In order to further improve the production capacity of the Lower Paleozoic carbonate gas reservoir in the northern part of the Yan’an Gas Field, targeted key technology research and breakthroughs have been carried out to address the complex paleogroove development, severe unbalanced development, and difficulty in developing low-pressure gas reservoirs in this area. The research results indicate that: 1)Integrated dynamic-static paleogroove characterization revealed a paleogeomorphic pattern featuring “north-south erosional grooves coexisting with local shallow pits in the south” of the study area, confirming an additional 75 km² of favorable area for the Mawu₁₊₂ reservoir and providing critical basis for well placement in the next step; 2)To address the difficulty of identifying fractures and pores in carbonate reservoirs, quantitative fracture-vug identification methods was established, confirming the primary production layer Mawu₁³ as predominantly vuggy and fractured-porous types, while secondary layers（Mawu₁¹, Mawu₁², Mawu₁⁴, Mawu₂¹, Mawu₂²） are mainly porous and tight types; 3)By quantitatively dividing and finely regulating the development units, the comprehensive decline rate of the gas reservoir has been reduced from 18.5% to 15.0%, effectively alleviating the unbalanced development of the gas field; 4)In response to the characteristics of weathered crust gas reservoirs and the problems in acid fracturing stimulation, suitable process systems were adopted for different reservoir characteristics by optimizing acid fracturing process parameters and introducing clean acid systems. This effectively reduced the acid rock reaction rate, improved scale inhibition performance, and significantly improved the effect of acid fracturing stimulation. Application of these technologies has achieved an average single-well absolute open flow potential of 7.69×10⁴ m³/d of Lower Paleozoic gas reservoirs in the northern central area of Yan’an Gas Field in recent years, enabling rapid and efficient production buildup.更多还原